Ohaelbs richter



UNITED STATES PATENT OFFICE.

CHARLES RICHTER, OF ST. PAUL, MINNESOTA, ASSIGNOR TO PETER R. L.HARDENBERGH, FERDINAND WILLINS, GUSTAV WILLINS, AND A. O.

BAILEY, OF SAME PL oE.

PROCESS OF PREPARING A SOLUTION FOR TAWING HIDES AND SKINS.

SPECIFICATION forming part of Letters Patent. No. 260,322, dated June27, 1882, Application filed J anna-ry 9, 1882. (No specimens.)

To all whom it may concern:

Be it known that I, OHAELEs RICHTER, of St. Paul, in the county ofRamsey and State of Minnesota, have invented a new and useful 5Improvement in Process of Preparing a Solution for Tawing Hides andSkins, of which the following is a specification.

The composition is prepared as follows: Fill a barrel or other vesselhalf-full of clay, pref- Io erably clay suitable for making bricks. Thenadd water sufficient to reduce the clay to a plastic mass, destroyingits adhesive qualities and forming a thick liquid. Then mix therewiththe following ingredients in substantially 15 the following proportions,viz: To every thirtytwo gallons of clay and water mixture add fourquarts of common salt and one pint of sulphuric acid. After an hour ortwo add also one quart of brewers yeast, and thoroughly incor- 2o poratethem. An effervescence will ensue and continue for abouttwenty-fourhours,and when it ceases the liquid compound will begin toprecipitate. When precipitated separate the impurities and thesupernatant water and put 25 the latter in a barrel. Then fill thebarrel or other vessel with water and dissolve therein six ounces ofalum to' every thirty-two gallons of liquid.

The composition thus prepared Will be useful in tawing hides and skins,and also useful 0 in tawing and coloring hides and skins in the mannerset forth in other applications which are intended to be simultaneouslyissued in Letters Patent of the same date herewith.

This patent is intended only to cover the pro- 35 cess of preparing thesolution. The other patents are intended to cover the modes of using thesolution in the entire processes covered thereby.

Salt and alum have been used in tawing 4o leather to form a subchlorideof aluminium in manner well known among tanners. My invention consistsin combining with articles heretofore used for producing a subchloride'of aluminium clay and other ingredients, as 4,5

hereinbei'ore set forth, precipitating the solid impurities,andpurifying the liquid residuum.

What I claim as my invention, and desire to secure by Letters Patent,is-

The process of preparing the solution More 0 said by mixing water,common salt, clay, sulphuric acid, brewers yeast, and alum,substantially as set forth.

CHARLES RICHTER.

In presence of- WALTER H. SANBoEN, GEO. W. RUssELL.

